P CODES (POWERTRAIN) P0900 - P0999

Truck Starts And Seems To Run Okay; I Am Afraid To Take Out On A Long Drive And Ruin Transmission. I Erased The Codes, But They Went Out...

Hello, We Have Flushed And Changed Solenoids, And It Still Continues To Slip Around 3rd Gear And As It Gets Hotter Is Slips Or Does Not...